As far as I’ve heard there has been no further action on Bluetooth support. As you mention, it will almost certainly need to come via a hardware addition as I’m pretty sure there is no BT readio in the Hub.
On a semi-related note, it’s interesting (at least to me) to speculate how additional hardware might come into play here. For instance, will we see something like a “secondary” hub that plugs into your router and provides additional radios (BT, WiFi, etc). And then the Hub and the 2nd hub talk to each other over the router?
Or might it be more in the line of an expansion module that connects directly to the existing hub? May you plug from the hub’s ethernet jack to the expansion module, which then itself plugs into the router?
Still another possibility would be for the expansion module to be completely wireless. You just plug it in and the hub talks to it via Zigbee or Zwave and the expansion “translates” the BT or Wifi or whatever communication.
Finally, there’s always the possibility of Hub 2.0 with built in BT, WiFi, etc. In this case a user would replace the old hub with the new all in one unit. (This seems the least desirable to me… It means I need to “re-buy” half the new hub as I already have a Zigbee and Zwave radio set. It also means I’d need to physically exclude and then repair every device I have: 43 devices already… not included about a dozen virtual tiles setup for various tasks.)